Adjustable scraper plate for mullers



Feb. 15, 1955 Filed Oct. 5, 1951 r R. H. M ELROY ADJUSTABLE SCRAPER PLATE FOR MULLERS ROY H.

3 Sheets-Sheet 1 INVENTOR.

MC ELROY BY 7mm, f AHJM'K ATTORNEYS Feb. 15, 1955 R. H. MCELROY 2,702,163

ADJUSTABLE SCRAPER PLATE FOR MULLERS Filed Oct. 5. 1951 S'Sheets-Sheet 2 IN V EN TOR.

ROY H. MC ELROY 7awk ATTORNEYS Feb. 15, 1955 R. H. MCELROY ADJUSTABLE SCRAPER PLATE FOR MULLERS Fild Oct. 5, 1951 S'Sheets-Sheet 3 .k TY O 9% mE M H Yr W ATTORNEYS United States Patent ADJUSTABLE SCRAPER PLATE FOR ROY Hardin McElroy, Dayton, Ohio, .assignor to Intern?ti(i:1lalEnginee1-ing, Inc, Dayton, Ohio, a corporation 0 0 '0 Application October 1951, Serial No. 249,946

3 Claims. (Cl. 241-119) This invention relates to mullers and particularly to an improved scraper arrangement in a dry pan muller in which the pan rotates while the muller rolls remain stationary.

The particular object of the present invention is the improvement of an improved construction for a muller of "the rotary pan type such that the life of the muller is increased while, at the same time, the problems of installation and maintenance thereof are decreased.

A still further object .is the provision of an improved scraper ararngement that serves to maintain the material being ground ingrinding position.

These and other objects and advantages will become more apparent upon reference to the following description taken in connection with the accompanying drawings, in which:

Figure l is a vertical transverse section, indicated by line 1-1 on Figure 2, with the cutting plane being offset;

Figure 2 is a plan section, indicated by line 22 on Figu Figure 3 is a perspective view showing the construction of the rear scraper blade assembly; and

Figure 4 is an enlarged sectional view taken along the lines 4-4 in Fig. 2 showing the manner in which 'the screen plates are supported in the pan of the machine.

Referring to the drawings somewhat more in .detail, the machine .of this invention comprises a frame consisting of thevertically arranged end frame members and 12 which rest on the floor, as at 14, being suitably connected therewith according to well-known practices, and which are interconnected at their upper ends by a cr s tie .16 secured .to the .end frame members by bolts 18. Th describcdparts comprising the .end frame .members 10 and 12 and the crosstie 16 comprise the main supporting structure for the machine.

The end frame members 10 and 12 rest, as will be noted in Figure l, on opposite edges of a pit 20 within which is disposed the rotatable pan 22 of the machine. Pan 22 comprises a central disk part 24 keyed to vertical shaft 26, as by key 28, and further secured thereto by the transversely extending bolt 30. Adjacent its periphery disk 24 receives the plates 32 retained thereon by bolts 34 and forming the muller track on which the muller rolls 36 roll as the pan is driven in rotation.

Extending outwardly from the periphery of the muller track formed by the plates 32 are the inclined screen plates 38 which are supported on the angular screen plate supporting brackets 40 that are carried between a dependent flange 42 on the edge of disk 24 and the cylindrical element 44 forming the pan rim. As will be seen in Figure 2, the screen plates 38 are apertured or slotted, as represented-at 46, for the passage therethrough of material which has been ground to the desired degree of fineness on the muller track.

The screen plates 38 are inclined upwardly, as shown, so that when material is thrown outwardly from the muller track by centrifugal force due to the rotation of the pan 2,702,163 Patented Feb. 15, 1955 chute by one or more suitably arranged pit scrapers, one of which bears the reference numeral in Figure .1.

Associated with each of the muller rolls :36 is a 5UP- port arm 52, preferably fabricated by welding together strips and bars so that at the end adjacent the muller roll a relatively heavy block 54 is provided for anchoring the muller shaft 56. Each muller shaft 56 carries the spaced anti-friction bearings 58 on which the associated muller roll is journaled. The shaft-is preferably .a dead shaft, as indicated, and this permits solidly anchoring the shaft in the block 54, as by the key 60 and screws 62, and journaling the roll on the relatively widely spaced bearings58.

The other end of each of the arms 52 embraces ashaft 64 at relatively widely separated points, and the ends of the shafts are journaled in the bearing boxes 66 carried on the inner face of the vertically extending plate 68forming a part of the adjacent end frame member. The arrangement is such that twisting forces on the arm exerted thereon by the grinding action .of the muller roll associated therewith are adequately carried on the widely spaced bearings and bearing boxes 66, and without imposing any severe stresses on the supporting shaft.64 or theend frame members.

It will be noted that each muller roll is slightly displaced from a center line passing through the pan of the machine parallel to the axes of the muller shafts, and .this positioning of the rolls is effective .for controlling the thrust on the rolls to minimize the twisting stresses on their supporting arms.

On each side of the pan :between the two muller rolls there are arranged scraper elements for delivering the material to be ground to the muller track ahead .of the rolls. One of these scrapers is identified by numeral 70 and is mounted on a vertical rod 72 carried in a bracket 74 mounted'on the inner face of the adjacent plate morn ber 68. Scraper'70 is vertically adjustable on the :rod 72 and thus can be positioned to bear as closely to the surface of the screen plates as is .desired. Inasmuch as it :is preferable .to maintain the spacing of the stationary scrapers 70 and the screen plates uniform, the said screen plates are preferably formed to .an arcuate configuration; whereby they :form a true frustum of a cone Whenwassembled about the periphery of the muller track.

A second scraper blade .is indicated at 76, land this scraper blade is vertically adjustable-on a pair of spaced rods 78 and 80. Rod 78 is carried on the end of .a bracket '82 mounted .on the :inner face of plate member 68, whereas rod 80 is mounted on the end of a horizontally extending bar 84 that is adjustable relative to bracket 82 in the direction of its length by means of a connection therewith which is illustrated more in detail in Figure 3.

In Figure 3 it will be noted that bar 84 has teeth 86 formed on one side thereof adapted for engagement with teeth 88 in block 90 pivotally mounted, as by means of pin 92, on bracket 82. A clamp block 94 is provided which serves tightly to clamp bar 84 in any of its adjusted positions by virtue of the screws 95 which extend through block 94 into block 90. The provision of the adjustability of bar 84 relative to bracket 82 permits scraper blade 76 to be adjusted to any predetermined angle relative to the muller track.

It will be understood that there are scraper blades on each side of the machine, as will be more clearly seen in Figure l.

The vertical shaft 26 that drives the pan in rotation has its upper and lower end journaled in suitable antifriction bearings.

The upper end of shaft 26 has keyed thereto a spider 98 carrying on its periphery a toothed gear rim 100. An annular housing part 102 is connected with the crosstie 16 for enclosing the said spider, and there may be provided the removable cover therefor 104, as illustrated in Figure 1.

Toothed gear rim meshes with a beveled gear 106 keyed by a key 108 to the end of drive shaft 110 which is journaled on the spaced anti-friction bearings 112 within a sleeve 114 having welded to the opposite ends thereof the bearing housing elements 116.

The combination of the sleeve 114, housing elements 116, and the drive shaft 110, together with its anti-fric- 'tridge isretained initsassembled position by a plate 122 having bolts 124 clamping it to the outer of the members 120. By the arrangement described, the driving shaft assembly can be manufactured as a subassembly and later brought together with the other parts of the machine to be assembled therewith. Similarly, the driving shaft assembly can be removed as a unit for servicing and reair. P Externally of the crosstie l6, shaft 110 rotatably supports drive pulley 128 adapted for being selectively connected to the said shaft by the friction clutch means, generally indicated at 130.

The lower end of the shaft 26 has its bearing in the bearing housing 138 that rests on support 124.

Bearing housing 138 is adapted for radial adjustability by means of the adjusting screws 152 spaced thereabout. In this manner the lower end of shaft 26 can be sub stantially aligned with the upper end thereof, and any misalignment of the shaft up to a substantial amount will be automaticallycompensated for by the self-aligning bearings at the upper and lower ends thereof.

At one side of the compartment that is apertured to receive bevel gear 106 on the end of shaft 110, there is provided the sealing closure plate 103 welded within the crosstie 16. journal the upper end of shaft 26 are sealed against the entrance of dust and other foreign matter. All of the bearings referred to are advantageously maintained in a lubricant bath at all times, and which may bemaintained under pressure if so desired further to insure against the entrance of foreign material into the bearing housings.

It will be understood that this invention is susceptible to modification in order to adapt it to different usages and conditions, and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim:

1. In a scraper arrangement for a muller of the nature described, a flat plate forming the scraper element, ver

tical rods attached to the ends of said plate for support-.

ing it in vertical adjustability, means in the ends of said plate for receiving said vertical rods, said rods being pivotable on their axes on said plate and vertically adjustable along the plate, a bar extending horizontally from the upper end of one rod having one side toothed, a toothed block to engage the toothed side of the bar, a clamp block for clamping the bar to the toothed block,- and Similarly, the anti-friction bearings that means pivotally supporting said blocks on an axis parallel with the axes of said rods.

2. In a muller; an annular muller track, a scraper plate angularly positioned over said track, vertical rods extending upwardly from the back of said plate, said rods being attached to said plate for axial adjustment therealong and for adjustment on the plate about their axes, means fixedly supporting the upper end of one of said rods, a bar extending horizontally from the upper end of theother of said rods, means clamping said bar for adjustment axially thereof, and means supporting said clamping means for pivotal movement thereof about an axis parallel to said rod.

In a muller having an annular muller track, a scraper plate angularly disposed over said track, vertical rods in back of said plate, clamping means carried by said plate receiving said rods for clamping them to said plate for adjustment of the rods angularly on their axes and for adjustment thereof axially along said plate, means fixedly supporting the upper end of the rod adjacent the end ofthe plate nearest the outside of said muller track, a bar fixed to and extending horizontally from the upper end of the other of said rods, a clamp receiving said bar and attached for clamping said bar in any position of axial adjustment of the bar in the clamp, and means supporting said clamp for pivoting movement about an axis parallel to the axis of said rods.

References Cited in the file of this patent UNITED STATES PATENTS 126,034 Cumings Apr. 23, 1872 306,987 Wood Oct. 21, 1884 454,780 Thompson June 23, 1903 580,079 Aubmann Apr. 6, 1897 799,244 Lehmann Sept. 12, 1905 944,073 Callaway Dec. 21, 1909 1,021,981 Galland Apr. 2, 1912 1,110,222 Morat Sept. 8, 1914 1,147,362 Bickley July 20, 1915 1,218,403 Howe Mar. 6, 1917 1,350,691 Williams Aug. 24, 1920 1,640,772 Hibbins Aug. 30, 1927 1,661,297 McMurray Mar. 6, 1928 1,872,469 Lang Aug. 16, 1932 2,246,991 Beardsley June 24, 1941 2,554,888 Wood May 29, 1951 FOREIGN PATENTS 264,055 Switzerland Sept. 30, 1949 532,484 Great Britain Jan. 24, 1941 

